blob: a6dbcf4d9ef57dcdfa93ecc045e51fd60a4b20d1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3 *
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/ioport.h>
Randy Dunlapd568df82006-07-12 01:47:00 -040028#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/list.h>
30#include <linux/sched.h>
31#include <linux/pm.h>
32#include <linux/device.h>
33#include <linux/proc_fs.h>
Harvey Harrison6697c052008-02-09 23:24:08 +010034#include <linux/acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#ifdef CONFIG_X86
36#include <asm/mpspec.h>
37#endif
Robert Hancock7752d5c2008-02-15 01:27:20 -080038#include <linux/pci.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <acpi/acpi_bus.h>
40#include <acpi/acpi_drivers.h>
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#define _COMPONENT ACPI_BUS_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050043ACPI_MODULE_NAME("bus");
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Len Brown4be44fc2005-08-05 00:44:28 -040045struct acpi_device *acpi_root;
46struct proc_dir_entry *acpi_root_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047EXPORT_SYMBOL(acpi_root_dir);
48
49#define STRUCT_TO_INT(s) (*((int*)&s))
50
51/* --------------------------------------------------------------------------
52 Device Management
53 -------------------------------------------------------------------------- */
54
Len Brown4be44fc2005-08-05 00:44:28 -040055int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Len Brown4be44fc2005-08-05 00:44:28 -040057 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -040061 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63 /* TBD: Support fixed-feature devices */
64
Len Brown4be44fc2005-08-05 00:44:28 -040065 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 if (ACPI_FAILURE(status) || !*device) {
Len Brown9805cb72006-07-25 13:30:57 -040067 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
68 handle));
Patrick Mocheld550d982006-06-27 00:41:40 -040069 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 }
71
Patrick Mocheld550d982006-06-27 00:41:40 -040072 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073}
Len Brown4be44fc2005-08-05 00:44:28 -040074
Linus Torvalds1da177e2005-04-16 15:20:36 -070075EXPORT_SYMBOL(acpi_bus_get_device);
76
Len Brown4be44fc2005-08-05 00:44:28 -040077int acpi_bus_get_status(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
Len Brown4be44fc2005-08-05 00:44:28 -040079 acpi_status status = AE_OK;
80 unsigned long sta = 0;
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -040084 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86 /*
87 * Evaluate _STA if present.
88 */
89 if (device->flags.dynamic_status) {
Len Brown4be44fc2005-08-05 00:44:28 -040090 status =
91 acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040093 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -040094 STRUCT_TO_INT(device->status) = (int)sta;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 }
96
97 /*
98 * Otherwise we assume the status of our parent (unless we don't
99 * have one, in which case status is implied).
100 */
101 else if (device->parent)
102 device->status = device->parent->status;
103 else
Bjorn Helgaas0c0e8922007-04-25 14:20:58 -0400104 STRUCT_TO_INT(device->status) =
105 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
106 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108 if (device->status.functional && !device->status.present) {
109 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
Len Brown4be44fc2005-08-05 00:44:28 -0400110 "functional but not present; setting present\n",
111 device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 device->status.present = 1;
113 }
114
Len Brown4be44fc2005-08-05 00:44:28 -0400115 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
116 device->pnp.bus_id,
117 (u32) STRUCT_TO_INT(device->status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Patrick Mocheld550d982006-06-27 00:41:40 -0400119 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Len Brown4be44fc2005-08-05 00:44:28 -0400122EXPORT_SYMBOL(acpi_bus_get_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Zhang Rui20733932008-01-17 15:51:21 +0800124void acpi_bus_private_data_handler(acpi_handle handle,
125 u32 function, void *context)
126{
127 return;
128}
129EXPORT_SYMBOL(acpi_bus_private_data_handler);
130
131int acpi_bus_get_private_data(acpi_handle handle, void **data)
132{
133 acpi_status status = AE_OK;
134
135 if (!*data)
136 return -EINVAL;
137
138 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
139 if (ACPI_FAILURE(status) || !*data) {
140 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
141 handle));
142 return -ENODEV;
143 }
144
145 return 0;
146}
147EXPORT_SYMBOL(acpi_bus_get_private_data);
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149/* --------------------------------------------------------------------------
150 Power Management
151 -------------------------------------------------------------------------- */
152
Len Brown4be44fc2005-08-05 00:44:28 -0400153int acpi_bus_get_power(acpi_handle handle, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
Len Brown4be44fc2005-08-05 00:44:28 -0400155 int result = 0;
156 acpi_status status = 0;
157 struct acpi_device *device = NULL;
158 unsigned long psc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161 result = acpi_bus_get_device(handle, &device);
162 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400163 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 *state = ACPI_STATE_UNKNOWN;
166
167 if (!device->flags.power_manageable) {
168 /* TBD: Non-recursive algorithm for walking up hierarchy */
169 if (device->parent)
170 *state = device->parent->power.state;
171 else
172 *state = ACPI_STATE_D0;
Len Brown4be44fc2005-08-05 00:44:28 -0400173 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 /*
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500175 * Get the device's power state either directly (via _PSC) or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 * indirectly (via power resources).
177 */
178 if (device->power.flags.explicit_get) {
Len Brown4be44fc2005-08-05 00:44:28 -0400179 status = acpi_evaluate_integer(device->handle, "_PSC",
180 NULL, &psc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400182 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400183 device->power.state = (int)psc;
184 } else if (device->power.flags.power_resources) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 result = acpi_power_get_inferred_state(device);
186 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400187 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 }
189
190 *state = device->power.state;
191 }
192
193 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400194 device->pnp.bus_id, device->power.state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Patrick Mocheld550d982006-06-27 00:41:40 -0400196 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
Len Brown4be44fc2005-08-05 00:44:28 -0400198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199EXPORT_SYMBOL(acpi_bus_get_power);
200
Len Brown4be44fc2005-08-05 00:44:28 -0400201int acpi_bus_set_power(acpi_handle handle, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
Len Brown4be44fc2005-08-05 00:44:28 -0400203 int result = 0;
204 acpi_status status = AE_OK;
205 struct acpi_device *device = NULL;
206 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209 result = acpi_bus_get_device(handle, &device);
210 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400211 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213 if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400214 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216 /* Make sure this is a valid target state */
217
218 if (!device->flags.power_manageable) {
Len Brown9805cb72006-07-25 13:30:57 -0400219 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
Greg Kroah-Hartman19c38de2007-09-12 15:06:57 -0700220 kobject_name(&device->dev.kobj)));
Patrick Mocheld550d982006-06-27 00:41:40 -0400221 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 }
David Shaohua Lib9131002005-03-19 00:16:18 -0500223 /*
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400224 * Get device's current power state
David Shaohua Lib9131002005-03-19 00:16:18 -0500225 */
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400226 acpi_bus_get_power(device->handle, &device->power.state);
Len Brownec683732008-01-23 22:41:20 -0500227 if ((state == device->power.state) && !device->flags.force_power_state) {
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500228 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
229 state));
230 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 }
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 if (!device->power.states[state].flags.valid) {
Len Browncece9292006-06-26 23:04:31 -0400234 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
Patrick Mocheld550d982006-06-27 00:41:40 -0400235 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 }
237 if (device->parent && (state < device->parent->power.state)) {
Len Browncece9292006-06-26 23:04:31 -0400238 printk(KERN_WARNING PREFIX
Thomas Renningera6fc6722006-06-26 23:58:43 -0400239 "Cannot set device to a higher-powered"
Len Browncece9292006-06-26 23:04:31 -0400240 " state than parent\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400241 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 }
243
244 /*
245 * Transition Power
246 * ----------------
247 * On transitions to a high-powered state we first apply power (via
248 * power resources) then evalute _PSx. Conversly for transitions to
249 * a lower-powered state.
David Shaohua Lib9131002005-03-19 00:16:18 -0500250 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 if (state < device->power.state) {
252 if (device->power.flags.power_resources) {
253 result = acpi_power_transition(device, state);
254 if (result)
255 goto end;
256 }
257 if (device->power.states[state].flags.explicit_set) {
Len Brown4be44fc2005-08-05 00:44:28 -0400258 status = acpi_evaluate_object(device->handle,
259 object_name, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 if (ACPI_FAILURE(status)) {
261 result = -ENODEV;
262 goto end;
263 }
264 }
Len Brown4be44fc2005-08-05 00:44:28 -0400265 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 if (device->power.states[state].flags.explicit_set) {
Len Brown4be44fc2005-08-05 00:44:28 -0400267 status = acpi_evaluate_object(device->handle,
268 object_name, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 if (ACPI_FAILURE(status)) {
270 result = -ENODEV;
271 goto end;
272 }
273 }
274 if (device->power.flags.power_resources) {
275 result = acpi_power_transition(device, state);
276 if (result)
277 goto end;
278 }
279 }
280
Len Brown4be44fc2005-08-05 00:44:28 -0400281 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 if (result)
Len Browncece9292006-06-26 23:04:31 -0400283 printk(KERN_WARNING PREFIX
284 "Transitioning device [%s] to D%d\n",
285 device->pnp.bus_id, state);
Shaohua Li5e321322007-10-11 23:53:58 +0200286 else {
287 device->power.state = state;
Len Brown4be44fc2005-08-05 00:44:28 -0400288 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
289 "Device [%s] transitioned to D%d\n",
290 device->pnp.bus_id, state));
Shaohua Li5e321322007-10-11 23:53:58 +0200291 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Patrick Mocheld550d982006-06-27 00:41:40 -0400293 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
Len Brown4be44fc2005-08-05 00:44:28 -0400295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296EXPORT_SYMBOL(acpi_bus_set_power);
297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298/* --------------------------------------------------------------------------
299 Event Management
300 -------------------------------------------------------------------------- */
301
Len Brown14e04fb2007-08-23 15:20:26 -0400302#ifdef CONFIG_ACPI_PROC_EVENT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303static DEFINE_SPINLOCK(acpi_bus_event_lock);
304
305LIST_HEAD(acpi_bus_event_list);
306DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
307
Len Brown4be44fc2005-08-05 00:44:28 -0400308extern int event_is_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Alexey Starikovskiy8db85d42007-09-26 19:43:16 +0400310int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
Alexey Starikovskiy8db85d42007-09-26 19:43:16 +0400312 struct acpi_bus_event *event;
Len Brown4be44fc2005-08-05 00:44:28 -0400313 unsigned long flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 /* drop event on the floor if no one's listening */
316 if (!event_is_open)
Patrick Mocheld550d982006-06-27 00:41:40 -0400317 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
319 event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
320 if (!event)
Patrick Mocheld550d982006-06-27 00:41:40 -0400321 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
Alexey Starikovskiy8db85d42007-09-26 19:43:16 +0400323 strcpy(event->device_class, device_class);
324 strcpy(event->bus_id, bus_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 event->type = type;
326 event->data = data;
327
328 spin_lock_irqsave(&acpi_bus_event_lock, flags);
329 list_add_tail(&event->node, &acpi_bus_event_list);
330 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
331
332 wake_up_interruptible(&acpi_bus_event_queue);
333
Patrick Mocheld550d982006-06-27 00:41:40 -0400334 return 0;
Alexey Starikovskiy8db85d42007-09-26 19:43:16 +0400335
336}
337
338EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
339
340int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
341{
342 if (!device)
343 return -EINVAL;
344 return acpi_bus_generate_proc_event4(device->pnp.device_class,
345 device->pnp.bus_id, type, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346}
Len Brown4be44fc2005-08-05 00:44:28 -0400347
Len Brown14e04fb2007-08-23 15:20:26 -0400348EXPORT_SYMBOL(acpi_bus_generate_proc_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Len Brown4be44fc2005-08-05 00:44:28 -0400350int acpi_bus_receive_event(struct acpi_bus_event *event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
Len Brown4be44fc2005-08-05 00:44:28 -0400352 unsigned long flags = 0;
353 struct acpi_bus_event *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 DECLARE_WAITQUEUE(wait, current);
356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 if (!event)
Patrick Mocheld550d982006-06-27 00:41:40 -0400359 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361 if (list_empty(&acpi_bus_event_list)) {
362
363 set_current_state(TASK_INTERRUPTIBLE);
364 add_wait_queue(&acpi_bus_event_queue, &wait);
365
366 if (list_empty(&acpi_bus_event_list))
367 schedule();
368
369 remove_wait_queue(&acpi_bus_event_queue, &wait);
370 set_current_state(TASK_RUNNING);
371
372 if (signal_pending(current))
Patrick Mocheld550d982006-06-27 00:41:40 -0400373 return -ERESTARTSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 }
375
376 spin_lock_irqsave(&acpi_bus_event_lock, flags);
Chuck Ebbertf0a37e02008-04-15 14:34:47 -0700377 if (!list_empty(&acpi_bus_event_list)) {
378 entry = list_entry(acpi_bus_event_list.next,
379 struct acpi_bus_event, node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 list_del(&entry->node);
Chuck Ebbertf0a37e02008-04-15 14:34:47 -0700381 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
383
384 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400385 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
387 memcpy(event, entry, sizeof(struct acpi_bus_event));
388
389 kfree(entry);
390
Patrick Mocheld550d982006-06-27 00:41:40 -0400391 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Len Brown14e04fb2007-08-23 15:20:26 -0400394#endif /* CONFIG_ACPI_PROC_EVENT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
396/* --------------------------------------------------------------------------
397 Notification Handling
398 -------------------------------------------------------------------------- */
399
400static int
Len Brown4be44fc2005-08-05 00:44:28 -0400401acpi_bus_check_device(struct acpi_device *device, int *status_changed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402{
Len Brown4be44fc2005-08-05 00:44:28 -0400403 acpi_status status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 struct acpi_device_status old_status;
405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400408 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
410 if (status_changed)
411 *status_changed = 0;
412
413 old_status = device->status;
414
415 /*
416 * Make sure this device's parent is present before we go about
417 * messing with the device.
418 */
419 if (device->parent && !device->parent->status.present) {
420 device->status = device->parent->status;
421 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
422 if (status_changed)
423 *status_changed = 1;
424 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400425 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 }
427
428 status = acpi_bus_get_status(device);
429 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400430 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400433 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
435 if (status_changed)
436 *status_changed = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 /*
439 * Device Insertion/Removal
440 */
441 if ((device->status.present) && !(old_status.present)) {
442 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
443 /* TBD: Handle device insertion */
Len Brown4be44fc2005-08-05 00:44:28 -0400444 } else if (!(device->status.present) && (old_status.present)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
446 /* TBD: Handle device removal */
447 }
448
Patrick Mocheld550d982006-06-27 00:41:40 -0400449 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450}
451
Len Brown4be44fc2005-08-05 00:44:28 -0400452static int acpi_bus_check_scope(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
Len Brown4be44fc2005-08-05 00:44:28 -0400454 int result = 0;
455 int status_changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
458 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400459 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
461 /* Status Change? */
462 result = acpi_bus_check_device(device, &status_changed);
463 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400464 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
466 if (!status_changed)
Patrick Mocheld550d982006-06-27 00:41:40 -0400467 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469 /*
470 * TBD: Enumerate child devices within this device's scope and
471 * run acpi_bus_check_device()'s on them.
472 */
473
Patrick Mocheld550d982006-06-27 00:41:40 -0400474 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475}
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477/**
478 * acpi_bus_notify
479 * ---------------
480 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
481 */
Len Brown4be44fc2005-08-05 00:44:28 -0400482static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483{
Len Brown4be44fc2005-08-05 00:44:28 -0400484 int result = 0;
485 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 if (acpi_bus_get_device(handle, &device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400489 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491 switch (type) {
492
493 case ACPI_NOTIFY_BUS_CHECK:
Len Brown4be44fc2005-08-05 00:44:28 -0400494 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
495 "Received BUS CHECK notification for device [%s]\n",
496 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 result = acpi_bus_check_scope(device);
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500498 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 * TBD: We'll need to outsource certain events to non-ACPI
Len Brown4be44fc2005-08-05 00:44:28 -0400500 * drivers via the device manager (device.c).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 */
502 break;
503
504 case ACPI_NOTIFY_DEVICE_CHECK:
Len Brown4be44fc2005-08-05 00:44:28 -0400505 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
506 "Received DEVICE CHECK notification for device [%s]\n",
507 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 result = acpi_bus_check_device(device, NULL);
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500509 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 * TBD: We'll need to outsource certain events to non-ACPI
Len Brown4be44fc2005-08-05 00:44:28 -0400511 * drivers via the device manager (device.c).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 */
513 break;
514
515 case ACPI_NOTIFY_DEVICE_WAKE:
Len Brown4be44fc2005-08-05 00:44:28 -0400516 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
517 "Received DEVICE WAKE notification for device [%s]\n",
518 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 /* TBD */
520 break;
521
522 case ACPI_NOTIFY_EJECT_REQUEST:
Len Brown4be44fc2005-08-05 00:44:28 -0400523 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
524 "Received EJECT REQUEST notification for device [%s]\n",
525 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 /* TBD */
527 break;
528
529 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
Len Brown4be44fc2005-08-05 00:44:28 -0400530 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
531 "Received DEVICE CHECK LIGHT notification for device [%s]\n",
532 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 /* TBD: Exactly what does 'light' mean? */
534 break;
535
536 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
Len Brown4be44fc2005-08-05 00:44:28 -0400537 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
538 "Received FREQUENCY MISMATCH notification for device [%s]\n",
539 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 /* TBD */
541 break;
542
543 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
Len Brown4be44fc2005-08-05 00:44:28 -0400544 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
545 "Received BUS MODE MISMATCH notification for device [%s]\n",
546 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 /* TBD */
548 break;
549
550 case ACPI_NOTIFY_POWER_FAULT:
Len Brown4be44fc2005-08-05 00:44:28 -0400551 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
552 "Received POWER FAULT notification for device [%s]\n",
553 device->pnp.bus_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 /* TBD */
555 break;
556
557 default:
Len Brown4be44fc2005-08-05 00:44:28 -0400558 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
559 "Received unknown/unsupported notification [%08x]\n",
560 type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 break;
562 }
563
Patrick Mocheld550d982006-06-27 00:41:40 -0400564 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565}
566
567/* --------------------------------------------------------------------------
568 Initialization/Cleanup
569 -------------------------------------------------------------------------- */
570
Len Brown4be44fc2005-08-05 00:44:28 -0400571static int __init acpi_bus_init_irq(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572{
Len Brown4be44fc2005-08-05 00:44:28 -0400573 acpi_status status = AE_OK;
574 union acpi_object arg = { ACPI_TYPE_INTEGER };
575 struct acpi_object_list arg_list = { 1, &arg };
576 char *message = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500579 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 * Let the system know what interrupt model we are using by
581 * evaluating the \_PIC object, if exists.
582 */
583
584 switch (acpi_irq_model) {
585 case ACPI_IRQ_MODEL_PIC:
586 message = "PIC";
587 break;
588 case ACPI_IRQ_MODEL_IOAPIC:
589 message = "IOAPIC";
590 break;
591 case ACPI_IRQ_MODEL_IOSAPIC:
592 message = "IOSAPIC";
593 break;
John Keller3948ec92006-12-22 11:50:04 -0600594 case ACPI_IRQ_MODEL_PLATFORM:
595 message = "platform specific model";
596 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 default:
598 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400599 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 }
601
602 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
603
604 arg.integer.value = acpi_irq_model;
605
606 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
607 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400608 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400609 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 }
611
Patrick Mocheld550d982006-06-27 00:41:40 -0400612 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613}
614
Alexey Starikovskiyad718602007-02-02 19:48:19 +0300615acpi_native_uint acpi_gbl_permanent_mmap;
616
617
Len Brown4be44fc2005-08-05 00:44:28 -0400618void __init acpi_early_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619{
Len Brown4be44fc2005-08-05 00:44:28 -0400620 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
622 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400623 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
Bob Moore61686122006-03-17 16:44:00 -0500625 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
626
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 /* enable workarounds, unless strict ACPI spec. compliance */
628 if (!acpi_strict)
629 acpi_gbl_enable_interpreter_slack = TRUE;
630
Alexey Starikovskiyad718602007-02-02 19:48:19 +0300631 acpi_gbl_permanent_mmap = 1;
632
633 status = acpi_reallocate_root_table();
634 if (ACPI_FAILURE(status)) {
635 printk(KERN_ERR PREFIX
636 "Unable to reallocate ACPI tables\n");
637 goto error0;
638 }
639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 status = acpi_initialize_subsystem();
641 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400642 printk(KERN_ERR PREFIX
643 "Unable to initialize the ACPI Interpreter\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 goto error0;
645 }
646
647 status = acpi_load_tables();
648 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400649 printk(KERN_ERR PREFIX
650 "Unable to load the System Description Tables\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 goto error0;
652 }
653
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654#ifdef CONFIG_X86
655 if (!acpi_ioapic) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 /* compatible (0) means level (3) */
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300657 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
658 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
659 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
660 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 /* Set PIC-mode SCI trigger type */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300662 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
Alexey Starikovskiy5f3b1a82007-02-02 19:48:22 +0300663 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 /*
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300666 * now that acpi_gbl_FADT is initialized,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 * update it with result from INT_SRC_OVR parsing
668 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300669 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 }
671#endif
672
Len Brown4be44fc2005-08-05 00:44:28 -0400673 status =
674 acpi_enable_subsystem(~
675 (ACPI_NO_HARDWARE_INIT |
676 ACPI_NO_ACPI_ENABLE));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 if (ACPI_FAILURE(status)) {
678 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
679 goto error0;
680 }
681
Patrick Mocheld550d982006-06-27 00:41:40 -0400682 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
Len Brown4be44fc2005-08-05 00:44:28 -0400684 error0:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 disable_acpi();
Patrick Mocheld550d982006-06-27 00:41:40 -0400686 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687}
688
Len Brown4be44fc2005-08-05 00:44:28 -0400689static int __init acpi_bus_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690{
Len Brown4be44fc2005-08-05 00:44:28 -0400691 int result = 0;
692 acpi_status status = AE_OK;
693 extern acpi_status acpi_os_initialize1(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
696 status = acpi_os_initialize1();
697
Len Brown4be44fc2005-08-05 00:44:28 -0400698 status =
699 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400701 printk(KERN_ERR PREFIX
702 "Unable to start the ACPI Interpreter\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 goto error1;
704 }
705
706 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400707 printk(KERN_ERR PREFIX
708 "Unable to initialize ACPI OS objects\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 goto error1;
710 }
711#ifdef CONFIG_ACPI_EC
712 /*
713 * ACPI 2.0 requires the EC driver to be loaded and work before
714 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
715 * is called).
716 *
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500717 * This is accomplished by looking for the ECDT table, and getting
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 * the EC parameters out of that.
719 */
720 status = acpi_ec_ecdt_probe();
721 /* Ignore result. Not having an ECDT is not fatal. */
722#endif
723
724 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
725 if (ACPI_FAILURE(status)) {
726 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
727 goto error1;
728 }
729
730 printk(KERN_INFO PREFIX "Interpreter enabled\n");
731
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500732 /* Initialize sleep structures */
733 acpi_sleep_init();
734
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 /*
736 * Get the system interrupt model and evaluate \_PIC.
737 */
738 result = acpi_bus_init_irq();
739 if (result)
740 goto error1;
741
742 /*
743 * Register the for all standard device notifications.
744 */
Len Brown4be44fc2005-08-05 00:44:28 -0400745 status =
746 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
747 &acpi_bus_notify, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 if (ACPI_FAILURE(status)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400749 printk(KERN_ERR PREFIX
750 "Unable to register for device notifications\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 goto error1;
752 }
753
754 /*
755 * Create the top ACPI proc directory
756 */
757 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
758
Patrick Mocheld550d982006-06-27 00:41:40 -0400759 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
761 /* Mimic structured exception handling */
Len Brown4be44fc2005-08-05 00:44:28 -0400762 error1:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 acpi_terminate();
Patrick Mocheld550d982006-06-27 00:41:40 -0400764 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765}
766
Greg Kroah-Hartman99e0d2f2007-11-02 16:19:59 -0700767struct kobject *acpi_kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Len Brown4be44fc2005-08-05 00:44:28 -0400769static int __init acpi_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770{
Len Brown4be44fc2005-08-05 00:44:28 -0400771 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 if (acpi_disabled) {
775 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400776 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 }
778
Greg Kroah-Hartmanf62ed9e2007-11-05 13:16:15 -0800779 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
Greg Kroah-Hartman99e0d2f2007-11-02 16:19:59 -0700780 if (!acpi_kobj) {
Harvey Harrison96b2dd12008-03-05 18:24:51 -0800781 printk(KERN_WARNING "%s: kset create error\n", __func__);
Greg Kroah-Hartman99e0d2f2007-11-02 16:19:59 -0700782 acpi_kobj = NULL;
783 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
785 result = acpi_bus_init();
786
787 if (!result) {
Robert Hancock7752d5c2008-02-15 01:27:20 -0800788 pci_mmcfg_late_init();
Len Brown9f9adec2007-12-13 17:38:03 -0500789 if (!(pm_flags & PM_APM))
790 pm_flags |= PM_ACPI;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 else {
Len Brown4be44fc2005-08-05 00:44:28 -0400792 printk(KERN_INFO PREFIX
793 "APM is already active, exiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 disable_acpi();
795 result = -ENODEV;
796 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 } else
798 disable_acpi();
799
Patrick Mocheld550d982006-06-27 00:41:40 -0400800 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801}
802
803subsys_initcall(acpi_init);